CN106786927A - A kind of passive balanced fail-safe circuit and a kind of battery pack - Google Patents
A kind of passive balanced fail-safe circuit and a kind of battery pack Download PDFInfo
- Publication number
- CN106786927A CN106786927A CN201611249808.9A CN201611249808A CN106786927A CN 106786927 A CN106786927 A CN 106786927A CN 201611249808 A CN201611249808 A CN 201611249808A CN 106786927 A CN106786927 A CN 106786927A
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- CN
- China
- Prior art keywords
- cell
- battery pack
- fail
- diode
- string
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000178 monomer Substances 0.000 description 13
- 238000000034 method Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The present invention relates to a kind of passive balanced fail-safe circuit and a kind of battery pack; the battery pack includes at least two cells; the two ends of each cell are parallel with passive equilibrium fail-safe circuit, and string is provided with controlling switch, equalizing resistance and the device with setting conduction voltage drop in the protection circuit.When controlling switch cannot disconnect, equalizing resistance persistently consumes the electric energy of cell, but, because the device that string sets has certain conduction voltage drop so that when voltage drops to the conduction voltage drop, the device is just no longer turned on cell, the voltage of cell is set to be not less than safety value, avoid cell from crossing to put, it is to avoid normal use and safe operation to cell and whole battery pack are impacted, more serious failure occurs in anti-locking system.
Description
Technical field
The present invention relates to a kind of passive balanced fail-safe circuit and a kind of battery pack, belong to the passive balancing technique of battery pack
Field.
Background technology
The inconsistency that lithium battery exists in use has badly influenced the performance of lithium battery group charge-discharge performance,
Based on proposing various BMS balancing solutions in the industry.Passive equalization scheme is because circuit is simple, small volume, cost
It is low, had a wide range of applications in terms of battery electric quantity equilibrium is solved.
Traditional passive equalization scheme is：Each cell two ends is parallel with a passive equilibrium circuit, passive equal
String is provided with controlling switch and equalizing resistance on weighing apparatus circuit, as shown in figure 1, Fig. 1 is with the passive balanced circuit of two cells
Example.Closed pair subject monomers battery carries out voltage between balanced discharge, raising cell after the instruction of controlling switch S reception systems
Uniformity.Controlling switch is balanced balanced with shut-off to realize unlatching according to the instruction break-make of controller.So, controlling switch can
It is most important by property, once thrashing does not send the open command of controlling switch S, or have all the way or multi-channel control is opened
The phenomenons such as pass S sticks together, short circuit, then controlling switch failure cannot normally disconnect, and can be constantly in conducting state, side circuit
It is changed into that equalizing resistance R is directly in parallel with corresponding cell, the equalization function of passive equilibrium BMS will failure, cell meeting
Equalizing resistance R is discharged always, equalizing resistance R persistently consumes electric energy, causes cell to cross and put, until cell fails,
Influence the normal use and safe operation of the cell and whole battery pack, in some instances it may even be possible to more serious event is caused to system
Barrier.Therefore, the emphasis that fail safe is future studies is carried out to passive equalizing circuit.
The content of the invention
It is an object of the invention to provide a kind of passive balanced fail-safe circuit, it is used to solve to be disconnected when controlling switch
When cell can be caused to cross the problem put.Present invention simultaneously provides a kind of battery pack.
To achieve the above object, the solution of the present invention includes a kind of passive balanced fail-safe circuit, right for being connected in parallel on
The two ends of the cell answered, string is provided with controlling switch and equalizing resistance in the protection circuit, is also gone here and there in the protection circuit
It is provided with the device with setting conduction voltage drop.
The device is a diode.
The device is the structure being made up of at least two Diode series, in parallel or series-parallel connection.
The equalizing resistance is parallel with instruction branch road, and string is provided with luminescent device on the instruction branch road.
The luminescent device is light emitting diode.
A kind of battery pack, including at least two cells, the two ends of each cell are parallel with passive balanced failure and protect
Protection circuit, string is provided with controlling switch and equalizing resistance in the protection circuit, and also string is provided with setting in the protection circuit
The device of conduction voltage drop.
The device is a diode.
The device is the structure being made up of at least two Diode series, in parallel or series-parallel connection.
The equalizing resistance is parallel with instruction branch road, and string is provided with luminescent device on the instruction branch road.
The luminescent device is light emitting diode.
The present invention provide passive balanced fail-safe circuit be with the difference of traditional balanced circuit：Also gone here and there in circuit
Be provided with the device with certain conduction voltage drop, when system do not send open command or controlling switch stick together, short circuit etc.
Phenomenon and when causing controlling switch to be not turned off, equalizing resistance persistently consumes the electric energy of cell, but, due to the device that string sets
Part has certain conduction voltage drop so that when voltage drops to the conduction voltage drop, the device is just no longer turned on cell, makes list
The voltage clamping of body battery and then makes voltage be not less than safety value in the conduction voltage drop of the device, it is to avoid cell is crossed and put, from
And avoid normal use and safe operation to cell and whole battery pack from impacting, prevent battery system from occurring tighter
The failure of weight.
Brief description of the drawings
Fig. 1 is the annexation schematic diagram of existing passive balanced circuit and cell；
Fig. 2 is that one of implementation method of passive equilibrium fail-safe circuit and the annexation of cell are illustrated
Figure；
Fig. 3 is the annexation schematic diagram of another implementation method with cell of passive equilibrium fail-safe circuit；
Fig. 4-a are Diode series structural representations；
Fig. 4-b are diodes in parallel structural representations；
Fig. 4-c are diode hybrid connected structure schematic diagrames.
Specific embodiment
Battery embodiment
As shown in Fig. 2 the battery pack in the present embodiment includes at least two cells being arranged in series, each monomer electricity
The two ends in pond are parallel with passive equilibrium fail-safe circuit.Because the cell in battery pack partly belongs to routine techniques,
Here just no longer specifically describe, passive equilibrium fail-safe circuit is specifically described below.
In Fig. 2 by taking two of which cell passive balanced fail-safe circuit in parallel as an example.As shown in Fig. 2 passive
String is provided with equalizing resistance R, controlling switch S and diode D in balanced fail-safe circuit, does not have strict between these three devices
Position relationship, as long as string is located in the protection circuit, but, unambiguously, in order to ensure that the protection circuit is normally transported
OK, the position of diode D can arbitrarily adjust, but the direction of anode and negative electrode can not change, i.e. the anode of diode D needs
The positive pole that other devices connect cell is directed or through, the negative electrode of diode D needs to direct or through other devices
Connect the negative pole of cell.The present embodiment provides a kind of specific position relationship, wherein, as shown in Fig. 2 cell is just
Pole connects one end of equalizing resistance R, one end of another termination controlling switch S of equalizing resistance R, another termination two of controlling switch S
The anode of pole pipe D, the negative electrode of diode D connects the negative pole of cell.Controlling switch S can be relay, metal-oxide-semiconductor, triode,
The electronic control type switching device such as light MOS.
When some or several monomer battery voltages are too high, corresponding controlling switch S receives close command and closes
Close, cell is discharged by equalizing resistance R and diode D；When the voltage of cell is normal, controlling switch S is connected to disconnected
Open instruction and disconnect, cell stops electric discharge.
Controlling switch S is closed or turned off according to the control instruction for receiving, and realizes putting the equilibrium of cell
Electricity stops electric discharge.In battery pack running, if thrashing does not send the open command of controlling switch S or a certain
Individual or multiple controlling switch S accidental damages (the such as failure such as adhesion, short circuit) and cannot disconnect, corresponding cell continue
Equalizing resistance R is discharged, but the presence of the conduction voltage drop due to diode D so that and monomer battery voltage discharges into the conducting
During pressure drop, diode D is no longer turned on, and the voltage of cell is restricted to conduction voltage drop, so, by the voltage of the conduction voltage drop
The referred to as safety value of monomer battery voltage.Therefore, in the case of the characteristic that diode D possesses conduction voltage drop, even if control is opened
Closing S cannot disconnect, and diode D can also be clamped to monomer battery voltage the conduction voltage drop of diode, make the voltage of cell
It is not less than safety value, it is ensured that cell is only put, it is to avoid more serious failure occurs in system.Moreover, it is also possible to according to battery
Flash-over characteristic selects suitable diode, the conduction voltage drop of diode is met condition, and final purpose is to make monomer battery voltage
It is not less than the conduction voltage drop of diode, i.e. conducting voltage.
In addition, the one-way conduction of diode can also avoid being caused during balanced line reversal in certain applications monomer
The problem of cell during discharge.In certain applications, if mistake passive balanced line reversal of the prior art
Equalization function can be caused to fail, cell persistently discharges equalizing resistance, cause cell to cross and put or equalizing circuit burning
Ruin, have a strong impact on system reliability, so, in the protection circuit that the present invention is provided, using the one-way conduction of diode D, make
Battery can only discharge by unidirectional current direction, in certain applications equalizing circuit reversal connection, automatic continuous will not discharge, and improve
The security and reliability of system.
So, the passive balanced fail-safe circuit both can be used for controlling switch S fail saves, and equilibrium is can be used for again
Line reversal is protected.And, when being applied to different battery types, only need to select suitable two pole according to the discharge curve of battery
Pipe, meets the conduction voltage drop of diode and requires.
Further, the another embodiment of the passive balanced fail-safe circuit that Fig. 3 is provided for the present invention, is in figure
The technical scheme further optimized on the basis of 2.As shown in figure 3, the two ends of equalizing resistance R are parallel with a branch road, this implementation
Be referred to as the branch road to indicate branch road by example, and string is provided with resistance R' and luminescent device on the instruction branch road, and the luminescent device is with luminous two
As a example by pole pipe LED.
When some or several monomer battery voltages are too high, corresponding controlling switch S receives close command and closes
Close, cell is discharged by equalizing resistance R and diode D, meanwhile, indicate the LED in branch road to be lit,
Show cell in electric discharge；When the voltage of cell is normal, controlling switch S is connected to open command and disconnects, monomer electricity
Pond stops electric discharge, and LED extinguishes, and represents that cell does not discharge.
And, implementation method corresponding with Fig. 2 similarly, suitable diode D is selected according to battery discharge characteristic, can be made
Monomer battery voltage is not less than the conducting voltage of diode D.Even if thrashing does not send controlling switch S open commands or control
When switch S failures cause the controlling switch S cannot to disconnect, diode D can be clamped to monomer battery voltage the conducting pressure of diode D
Drop, it is ensured that cell is only put, meanwhile, when monomer battery voltage is clamped to the conducting voltage of diode D, light emitting diode
LED extinguishes.
So, can intuitively know corresponding cell whether in electric discharge by the luminous situation of LED.
Therefore, can be seen that the passive balanced fail-safe circuit by above-mentioned two embodiment has advantages below：
(1) clamper is carried out using diode when controlling switch cannot disconnect, it is to avoid cell is crossed and put；
(2) in certain applications, it is to avoid the cell continuous discharge that balanced line reversal is caused；
(3) circuit structure is simple, dependable performance, be easy to implement, with certain versatility and autgmentability, it is possible to increase quilt
Dynamic reliability, security in a balanced way.
In addition, in above-described embodiment, what string set in protection circuit is single diode, it is real as other implementation methods
Now there is the structure of conduction voltage drop and one-way conduction in addition to single diode, can also be by least two diode strings
The circuit structure that connection, in parallel or series-parallel connection are constituted, as shown in Fig. 4-a, Fig. 4-b and Fig. 4-c.And, in above-described embodiment, while
The characteristic with conduction voltage drop and one-way conduction of diode make use of to can solve the problem that more than one technical problem, this is a kind of
The implementation method of optimization, only using the conduction voltage drop of diode, this characteristic just can solve the problem that the technology that presently, there are lacks in fact
Fall into --- cell can be caused to cross when controlling switch cannot disconnect put.So, one-way conduction is shot off, only talking, there is conducting to press
If the device of drop, then, due to the possible more than diode of the device only with conduction voltage drop characteristic, this is a kind of, so, this hair
The device with conduction voltage drop in the passive balanced fail-safe circuit of bright protection can also be other in addition to diode
It is same that there is setting, i.e., the device of certain this characteristic of conduction voltage drop.
Passive equilibrium fail-safe circuit embodiment
Passive balanced fail-safe circuit in due to the present embodiment has been made that in detail in above-mentioned battery embodiment
Ground description, just no longer illustrates here.
Specific embodiment is presented above, but the present invention is not limited to described implementation method.Base of the invention
This thinking is above-mentioned basic scheme, and for those of ordinary skill in the art, various changes are designed in teaching of the invention
The model of shape, formula, parameter simultaneously need not spend creative work.It is right without departing from the principles and spirit of the present invention
Change, modification, replacement and the modification that implementation method is carried out are still fallen within protection scope of the present invention.
Claims (10)
1. a kind of passive balanced fail-safe circuit, the two ends for being connected in parallel on corresponding cell, in the protection circuit
String is provided with controlling switch and equalizing resistance, it is characterised in that also string is provided with setting conduction voltage drop in the protection circuit
Device.
2. passive balanced fail-safe circuit according to claim 1, it is characterised in that the device is two poles
Pipe.
3. passive balanced fail-safe circuit according to claim 1, it is characterised in that the device is by least two
The structure that Diode series, parallel connection or series-parallel connection are constituted.
4. passive balanced fail-safe circuit according to claim 1, it is characterised in that the equalizing resistance is parallel with finger
Show branch road, string is provided with luminescent device on the instruction branch road.
5. passive balanced fail-safe circuit according to claim 4, it is characterised in that the luminescent device is luminous two
Pole pipe.
6. a kind of battery pack, including at least two cells, the two ends of each cell are parallel with passive equilibrium fail safe
Circuit, string is provided with controlling switch and equalizing resistance in the protection circuit, it is characterised in that also string is provided with the protection circuit
Device with setting conduction voltage drop.
7. battery pack according to claim 6, it is characterised in that the device is a diode.
8. battery pack according to claim 6, it is characterised in that the device be by least two Diode series and
The structure that connection or series-parallel connection are constituted.
9. battery pack according to claim 6, it is characterised in that the equalizing resistance is parallel with instruction branch road, the finger
Show that string is provided with luminescent device on branch road.
10. battery pack according to claim 9, it is characterised in that the luminescent device is light emitting diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611249808.9A CN106786927A (en) | 2016-12-29 | 2016-12-29 | A kind of passive balanced fail-safe circuit and a kind of battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611249808.9A CN106786927A (en) | 2016-12-29 | 2016-12-29 | A kind of passive balanced fail-safe circuit and a kind of battery pack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106786927A true CN106786927A (en) | 2017-05-31 |
Family
ID=58927512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611249808.9A Pending CN106786927A (en) | 2016-12-29 | 2016-12-29 | A kind of passive balanced fail-safe circuit and a kind of battery pack |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106786927A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109638907A (en) * | 2018-11-28 | 2019-04-16 | 江苏南自通华电力自动化股份有限公司 | Battery group monomer voltage On-line Measuring Method based on high current active equalization |
| CN109888133A (en) * | 2017-12-06 | 2019-06-14 | 中国科学院沈阳自动化研究所 | A kind of long-term observation lander energy management system |
| CN110365068A (en) * | 2018-04-09 | 2019-10-22 | 凹凸电子（武汉）有限公司 | Balance balancing circuitry and its guard method, battery pack of multiple battery units |
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| WO2010038347A1 (en) * | 2008-09-30 | 2010-04-08 | パナソニック株式会社 | Cell equalization circuit and cell power supply device |
| JP2011018537A (en) * | 2009-07-08 | 2011-01-27 | Panasonic Corp | Battery pack and battery system |
| CN102570408A (en) * | 2011-12-31 | 2012-07-11 | 南京德朔实业有限公司 | Over-discharge protection circuit for lithium battery |
| CN106240391A (en) * | 2016-08-15 | 2016-12-21 | 惠州市蓝微新源技术有限公司 | A kind of passive equalizing circuit of battery management system |
-
2016
- 2016-12-29 CN CN201611249808.9A patent/CN106786927A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010038347A1 (en) * | 2008-09-30 | 2010-04-08 | パナソニック株式会社 | Cell equalization circuit and cell power supply device |
| JP2011018537A (en) * | 2009-07-08 | 2011-01-27 | Panasonic Corp | Battery pack and battery system |
| CN102570408A (en) * | 2011-12-31 | 2012-07-11 | 南京德朔实业有限公司 | Over-discharge protection circuit for lithium battery |
| CN106240391A (en) * | 2016-08-15 | 2016-12-21 | 惠州市蓝微新源技术有限公司 | A kind of passive equalizing circuit of battery management system |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109888133A (en) * | 2017-12-06 | 2019-06-14 | 中国科学院沈阳自动化研究所 | A kind of long-term observation lander energy management system |
| CN110365068A (en) * | 2018-04-09 | 2019-10-22 | 凹凸电子（武汉）有限公司 | Balance balancing circuitry and its guard method, battery pack of multiple battery units |
| US11139662B2 (en) | 2018-04-09 | 2021-10-05 | O2Micro Inc. | Balance circuits for battery cells |
| CN109638907A (en) * | 2018-11-28 | 2019-04-16 | 江苏南自通华电力自动化股份有限公司 | Battery group monomer voltage On-line Measuring Method based on high current active equalization |
| CN109638907B (en) * | 2018-11-28 | 2020-11-03 | 江苏南自通华电力自动化股份有限公司 | Storage battery pack monomer voltage on-line measurement method based on large-current active equalization |
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Application publication date: 20170531 |